Eroare de compilare: user.cpp: In function ‘void read()’: user.cpp:22:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<a.size(); i++) ^ user.cpp:34:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<a.size(); i++) ^ user.cpp:37:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<a[i].size(); j++) ^ user.cpp: In function ‘void sp(int)’: user.cpp:48:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (; i<a.size(); i++) ^ user.cpp:52:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i==a.size() || a[i][x]==0) ^ user.cpp: In function ‘void adun(int)’: user.cpp:63:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=x+1; i<a.size(); i++) ^ user.cpp:66:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=x; j<a[i].size(); j++) ^ user.cpp: In function ‘void solve()’: user.cpp:75:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<a.size(); i++) ^ user.cpp: In function ‘void write()’: user.cpp:92:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<a.size(); j++) ^ user.cpp:99:38: error: ‘for_each’ was not declared in this scope for_each(s.begin(),s.end(),qwerty); //afisarea vectorului solutiilor ^ user.cpp: At global scope: user.cpp:102:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main() ^