Compilare: main.cpp: In member function 'void DSU::afis()': main.cpp:112:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int i = 1;i <= n;i++)printf("%d ",father[i]);printf("\n"); ^~~ main.cpp:112:58: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' for(int i = 1;i <= n;i++)printf("%d ",father[i]);printf("\n"); ^~~~~~ main.cpp:113:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(int i = 1;i <= n;i++)printf("%d ",sz[i]);printf("\n"); ^~~ main.cpp:113:54: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' for(int i = 1;i <= n;i++)printf("%d ",sz[i]);printf("\n"); ^~~~~~ main.cpp:114:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(auto it:edge_history)printf("%d ",it);printf("\n"); ^~~ main.cpp:114:51: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' for(auto it:edge_history)printf("%d ",it);printf("\n"); ^~~~~~ main.cpp:115:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(auto it:history)printf("%d %d\n",it.first,it.second);printf("\n"); ^~~ main.cpp:115:66: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' for(auto it:history)printf("%d %d\n",it.first,it.second);printf("\n"); ^~~~~~ main.cpp: In function 'int main()': main.cpp:175:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&m); ^ main.cpp:178:59: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&edges[i].first,&edges[i].second); ^