Compilare: user.cpp: In function ‘int main()’: user.cpp:28:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < q.size(); i++) ^ user.cpp:31:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < a[i].size(); j++) ^ user.cpp:58:56: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = x % s; i < a[x / s] .size(); i++) w += a[x / s][i]; ^ user.cpp:72:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < q.size() && w + q[i] < x) w += q[i], i++; ^ user.cpp:73:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < q.size() && w + q[i] == x) w += q[i], j = a[i].size(); ^ user.cpp:75:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j < a[i].size() && w + a[i][j] < x) w += a[i][j], j++; ^ user.cpp:76:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j < a[i].size() && w + a[i][j] == x) w += a[i][j], j++; ^