Compilare: main.cpp: In function 'void eval(int, int)': main.cpp:44:26: warning: suggest parentheses around assignment used as truth value [-Wparentheses] while (p = strchr(q, '+')) { ^ main.cpp: In function 'void read()': main.cpp:16:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &k); ^ main.cpp:19:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &i, &j); ^ main.cpp:20:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", input[i][j]); ^ main.cpp: In function 'int main()': main.cpp:96:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mxl.in", "r", stdin); ^ main.cpp:97:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mxl.out", "w", stdout); ^