Compilare: main.cpp: In function 'void dfs1(int)': main.cpp:55:13: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if(vertex[it].first!=vertex[nod].first) ^~ main.cpp:57:17: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' dfs1(it); ^~~~ In file included from /usr/include/c++/6/cassert:44:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:33, from main.cpp:1: main.cpp: In function 'void build(int, int, int, int)': main.cpp:65:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(dr < str[k].size()); ~~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:138:18: warning: unused variable 'j' [-Wunused-variable] int n, q, i, j, a, b , val_max=0; ^ main.cpp:138:28: warning: unused variable 'val_max' [-Wunused-variable] int n, q, i, j, a, b , val_max=0; ^~~~~~~ main.cpp: In function 'int lca(int, int)': main.cpp:110:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:136:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("heavypath.in","r",stdin); ^ main.cpp:137:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("heavypath.out","w",stdout); ^ main.cpp:141:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&value[i]); ^ main.cpp:144:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^