Compilare: main.cpp: In function 'int calc_min_diff(int, int)': main.cpp:162:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (r_ind + 1 < v[r].size()) ~~~~~~~~~~^~~~~~~~~~~~~ main.cpp:168:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (l_ind + 1 < v[l].size()) ~~~~~~~~~~^~~~~~~~~~~~~ main.cpp: In function 'int32_t main()': main.cpp:256:14: warning: left operand of comma operator has no effect [-Wunused-value] debug(m, cur, lower, eq); ^ main.cpp:131:21: note: in definition of macro 'debug' #define debug(...) (__VA_ARGS__) ^~~~~~~~~~~ main.cpp:256:19: warning: right operand of comma operator has no effect [-Wunused-value] debug(m, cur, lower, eq); ^ main.cpp:131:21: note: in definition of macro 'debug' #define debug(...) (__VA_ARGS__) ^~~~~~~~~~~ main.cpp:256:26: warning: right operand of comma operator has no effect [-Wunused-value] debug(m, cur, lower, eq); ^ main.cpp:131:21: note: in definition of macro 'debug' #define debug(...) (__VA_ARGS__) ^~~~~~~~~~~ main.cpp:201:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(PROB_NAME".in", "r", stdin); ^ main.cpp:202:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(PROB_NAME".out", "w", stdout); ^