Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:19:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<g[nod].size();j++){ ~^~~~~~~~~~~~~~ user.cpp:36:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<g[nod].size();j++){ ~^~~~~~~~~~~~~~ user.cpp:37:7: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation] if(h[g[nod][j]]==h[nod]+1); ^~ user.cpp:38:8: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’ if(low[g[nod][j]]>=h[nod]) ^~ user.cpp:14:12: warning: unused variable ‘j’ [-Wunused-variable] int fiu, j; ^ user.cpp: In function ‘int main()’: user.cpp:79:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(q=0;q<g[rad].size();q++) ~^~~~~~~~~~~~~~ user.cpp:89:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<cc.size();i++){ ~^~~~~~~~~~ user.cpp:93:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sol.size();i++){\ ~^~~~~~~~~~~ user.cpp:55:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d", &n, &m); ^ user.cpp:57:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d", &x, &y); ^ user.cpp:68:11: warning: iteration 100001 invokes undefined behavior [-Waggressive-loop-optimizations] low[i]=0; ~~~~~~^~ user.cpp:67:14: note: within this loop for(int i=0;i<=100001;i++){ ~^~~~~~~~ user.cpp:65:11: warning: iteration 100001 invokes undefined behavior [-Waggressive-loop-optimizations] viz[i]=0; ~~~~~~^~ user.cpp:64:14: note: within this loop for(int i=0;i<=100001;i++){ ~^~~~~~~~ user.cpp:62:9: warning: iteration 100001 invokes undefined behavior [-Waggressive-loop-optimizations] h[i]=0; ~~~~^~ user.cpp:61:14: note: within this loop for(int i=0;i<=100001;i++){ ~^~~~~~~~