Language: C++

#include<bits/stdc++.h>
#define U [7<<15]={}
#define G )+((c=A[a]+A[P[a]]+C[a])%k?c:0)-M(
typedef long long L;using namespace std;map<L,L>T U;L P U,E U,Z U,H U,C U,A U,O U,X U,B U,k,n,a,b,c;char s U;L M(L f){return f?B[f]+M(f^f&-f):0;}L S(L a,L i){for(a=M(i++G i);i<2e5;i+=i&-i)B[i]+=a;}L D(L f){L d;for(map<L,L>::iterator I=T[f].begin();I!=T[f].end();I++)d=I->first,d&&!E[d]?P[d]=f,E[d]=E[f]+1,C[d]=I->second,D(d),Z[f]+=++Z[d],Z[H[f]]<Z[d]?H[f]=d:0:0;}L K(L f){a=X[f];n=X[b];return a-n?M(O[E[a]<E[n]?a=n,n=b,b=f,n:f]G O[a])+K(P[a]):abs(M(O[f])-M(O[b]));}main(){for(cin>>n>>k;--*Z+n;T[a][b]=T[b][a]=c)cin>>a>>b>>c;for(D(a=n=0);Z[n];a=H[P[++n]]-n?n:0)for(;!O[a];S(a=H[a],O[a]=++b))X[a]=n;PRINT();for(cin>>a;cin>>s>>a>>b;S(H[a],O[a]),S(a,O[a]-1))*s&2?cout<<K(a)<<endl,0:A[a]+=b;}

Compiler output:
a.cc: In function 'L S(L, L)':
a.cc:4:197: warning: no return statement in function returning non-void [-Wreturn-type]
    4 | typedef long long L;using namespace std;map<L,L>T U;L P U,E U,Z U,H U,C U,A U,O U,X U,B U,k,n,a,b,c;char s U;L M(L f){return f?B[f]+M(f^f&-f):0;}L S(L a,L i){for(a=M(i++G i);i<2e5;i+=i&-i)B[i]+=a;}L D(L f){L d;for(map<L,L>::iterator I=T[f].begin();I!=T[f].end();I++)d=I->first,d&&!E[d]?P[d]=f,E[d]=E[f]+1,C[d]=I->second,D(d),Z[f]+=++Z[d],Z[H[f]]<Z[d]?H[f]=d:0:0;}L K(L f){a=X[f];n=X[b];return a-n?M(O[E[a]<E[n]?a=n,n=b,b=f,n:f]G O[a])+K(P[a]):abs(M(O[f])-M(O[b]));}main(){for(cin>>n>>k;--*Z+n;T[a][b]=T[b][a]=c)cin>>a>>b>>c;for(D(a=n=0);Z[n];a=H[P[++n]]-n?n:0)for(;!O[a];S(a=H[a],O[a]=++b))X[a]=n;PRINT();for(cin>>a;cin>>s>>a>>b;S(H[a],O[a]),S(a,O[a]-1))*s&2?cout<<K(a)<<endl,0:A[a]+=b;}
      |                                                                                                                                                                                                     ^
a.cc: In function 'L D(L)':
a.cc:4:363: warning: no return statement in function returning non-void [-Wreturn-type]
    4 | typedef long long L;using namespace std;map<L,L>T U;L P U,E U,Z U,H U,C U,A U,O U,X U,B U,k,n,a,b,c;char s U;L M(L f){return f?B[f]+M(f^f&-f):0;}L S(L a,L i){for(a=M(i++G i);i<2e5;i+=i&-i)B[i]+=a;}L D(L f){L d;for(map<L,L>::iterator I=T[f].begin();I!=T[f].end();I++)d=I->first,d&&!E[d]?P[d]=f,E[d]=E[f]+1,C[d]=I->second,D(d),Z[f]+=++Z[d],Z[H[f]]<Z[d]?H[f]=d:0:0;}L K(L f){a=X[f];n=X[b];return a-n?M(O[E[a]<E[n]?a=n,n=b,b=f,n:f]G O[a])+K(P[a]):abs(M(O[f])-M(O[b]));}main(){for(cin>>n>>k;--*Z+n;T[a][b]=T[b][a]=c)cin>>a>>b>>c;for(D(a=n=0);Z[n];a=H[P[++n]]-n?n:0)for(;!O[a];S(a=H[a],O[a]=++b))X[a]=n;PRINT();for(cin>>a;cin>>s>>a>>b;S(H[a],O[a]),S(a,O[a]-1))*s&2?cout<<K(a)<<endl,0:A[a]+=b;}
      |                                                                                                                                                                                                                                                                                                                                                                           ^
a.cc: At global scope:
a.cc:4:466: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    4 | typedef long long L;using namespace std;map<L,L>T U;L P U,E U,Z U,H U,C U,A U,O U,X U,B U,k,n,a,b,c;char s U;L M(L f){return f?B[f]+M(f^f&-f):0;}L S(L a,L i){for(a=M(i++G i);i<2e5;i+=i&-i)B[i]+=a;}L D(L f){L d;for(map<L,L>::iterator I=T[f].begin();I!=T[f].end();I++)d=I->first,d&&!E[d]?P[d]=f,E[d]=E[f]+1,C[d]=I->second,D(d),Z[f]+=++Z[d],Z[H[f]]<Z[d]?H[f]=d:0:0;}L K(L f){a=X[f];n=X[b];return a-n?M(O[E[a]<E[n]?a=n,n=b,b=f,n:f]G O[a])+K(P[a]):abs(M(O[f])-M(O[b]));}main(){for(cin>>n>>k;--*Z+n;T[a][b]=T[b][a]=c)cin>>a>>b>>c;for(D(a=n=0);Z[n];a=H[P[++n]]-n?n:0)for(;!O[a];S(a=H[a],O[a]=++b))X[a]=n;PRINT();for(cin>>a;cin>>s>>a>>b;S(H[a],O[a]),S(a,O[a]-1))*s&2?cout<<K(a)<<endl,0:A[a]+=b;}
      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  ^~~~
a.cc: In function 'int main()':
a.cc:4:598: error: 'PRINT' was not declared in this scope
    4 | typedef long long L;using namespace std;map<L,L>T U;L P U,E U,Z U,H U,C U,A U,O U,X U,B U,k,n,a,b,c;char s U;L M(L f){return f?B[f]+M(f^f&-f):0;}L S(L a,L i){for(a=M(i++G i);i<2e5;i+=i&-i)B[i]+=a;}L D(L f){L d;for(map<L,L>::iterator I=T[f].begin();I!=T[f].end();I++)d=I->first,d&&!E[d]?P[d]=f,E[d]=E[f]+1,C[d]=I->second,D(d),Z[f]+=++Z[d],Z[H[f]]<Z[d]?H[f]=d:0:0;}L K(L f){a=X[f];n=X[b];return a-n?M(O[E[a]<E[n]?a=n,n=b,b=f,n:f]G O[a])+K(P[a]):abs(M(O[f])-M(O[b]));}main(){for(cin>>n>>k;--*Z+n;T[a][b]=T[b][a]=c)cin>>a>>b>>c;for(D(a=n=0);Z[n];a=H[P[++n]]-n?n:0)for(;!O[a];S(a=H[a],O[a]=++b))X[a]=n;PRINT();for(cin>>a;cin>>s>>a>>b;S(H[a],O[a]),S(a,O[a]-1))*s&2?cout<<K(a)<<endl,0:A[a]+=b;}
      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      ^~~~~