Compilare: user.cpp: In function ‘int main()’: user.cpp:15:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<=m;i++){ ^ user.cpp:21:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<=n;i++)u[i]=0; ^ user.cpp:24:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<=n;i++){ ^ user.cpp:26:39: 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:28:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<am[i].size();j++) ^ user.cpp:31:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int p=0;p<c;p++) ^ user.cpp:32:64: 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:40:31: 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:42:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++){ ^ user.cpp:44:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<pr[i][1009];j++){ ^