Compilare: main.cpp: In function 'int solve2(int, int, int)': main.cpp:75:11: warning: unused variable 'sum' [-Wunused-variable] int sum = area(r) * 2; ^~~ main.cpp: In function 'int main()': main.cpp:139:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ternar.in", "r", stdin); ^ main.cpp:140:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ternar.out", "w", stdout); ^ main.cpp:143:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:146:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i][j]); ^