Compilare: main.cpp: In function 'int solve()': main.cpp:107:7: warning: unused variable 'tdst' [-Wunused-variable] int tdst = it.first; ^~~~ main.cpp: In function 'void readInput()': main.cpp:128:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &R, &C); ^ main.cpp:131:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf(" %c", &M[i][j]); ^ main.cpp: In function 'int main()': main.cpp:140:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(InFile, "r", stdin); ^ main.cpp:141:30: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(OuFile, "w", stdout); ^