Compilare: user.cpp: In function ‘void solve()’: user.cpp:85:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < codes.size(); ++ i) ^ user.cpp:114:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 1; i < codes.size(); ++ i) { ^ user.cpp:54:78: warning: unused variable ‘mid’ [-Wunused-variable] int n, m, last, cnt, k, i, j, half, lat, i2, j2, len, lmax, left, right, mid; ^ user.cpp: In function ‘int main()’: user.cpp:138:19: warning: unused variable ‘n’ [-Wunused-variable] int tc, test, n, m, k; ^ user.cpp:138:22: warning: unused variable ‘m’ [-Wunused-variable] int tc, test, n, m, k; ^ user.cpp:138:25: warning: unused variable ‘k’ [-Wunused-variable] int tc, test, n, m, k; ^ user.cpp: In function ‘void solve()’: user.cpp:56:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &m, &k); ^ user.cpp:59:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &pixel[i][j]); ^ user.cpp: In function ‘int main()’: user.cpp:136:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("poze.in", "r", stdin); ^ user.cpp:137:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("poze.out", "w", stdout); ^ user.cpp:140:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &tc); ^