Compilare: main.cpp: In function 'void solve()': main.cpp:25:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[nod].size(); i++){ ~^~~~~~~~~~~~~~ main.cpp:37:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<=v[n].size(); i++){ ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:57:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.in","r",stdin); ^ main.cpp:58:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.out", "w", stdout); ^ main.cpp:66:27: warning: 'z' may be used uninitialized in this function [-Wmaybe-uninitialized] c[x][y].ft=w; c[x][y].sd=z; c[y][x].sd=-z; ~~~~~~~~~~^~