Compilare: main.cpp: In function 'void solve(int, int)': main.cpp:113:19: warning: suggest parentheses around assignment used as truth value [-Wparentheses] vis[i] = h[i] = 0; ~~~~~^~~ main.cpp: In function 'int main()': main.cpp:125:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("makebipartite.in", "r", stdin); ^ main.cpp:126:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("makebipartite.out", "w", stdout); ^ main.cpp:129:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ main.cpp:132:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:134:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &X[i], &Y[i]); ^