Compilare: main.cpp: In function 'int find_opt(int, int, int, int, int)': main.cpp:56:9: warning: variable 'start' set but not used [-Wunused-but-set-variable] int start = ind; ^~~~~ main.cpp: In function 'int main()': main.cpp:120:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("connect.in", "r", stdin); ^ main.cpp:121:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("connect.out", "w", stdout); ^ main.cpp:123:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:133:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x[i], &y[i]); ^