Compilare: user.cpp: In function ‘int main()’: user.cpp:16:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<=m;i++){ ^ user.cpp:22:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<=n;i++)u[i]=0; ^ user.cpp:25:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<=n;i++){ ^ user.cpp:27:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<am[i].size();j++){c=am[i][j]; u[c]=1;} ^ user.cpp:29:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<am[i].size();j++) ^ user.cpp:32:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int p=0;p<c;p++) ^ user.cpp:33:64: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (u[am[am[i][j]][p]]!=1 && am[am[i][j]][p]!=i) ^ user.cpp:41:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<am[i].size();j++){u[am[i][j]]=0;} ^ user.cpp:43:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++){ ^ user.cpp:45:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<pr[i].size();j++){ ^