foo.cc: In function 'int main()':
foo.cc:46:26: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
46 | for(int j=0;v2.size()<len;j++) {
| ~~~~~~~~~^~~~
foo.cc:51:35: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
51 | for(int j=v.size()-1;v1.size()<len;j--) {
| ~~~~~~~~~^~~~
foo.cc:64:26: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
64 | for(int j=0;v2.size()<len+1;j++) {
| ~~~~~~~~~^~~~~~
foo.cc:69:35: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
69 | for(int j=v.size()-1;v1.size()<len;j--) {
| ~~~~~~~~~^~~~
foo.cc:35:7: warning: unused variable 'S' [-Wunused-variable]
35 | int S=v.size()-1;
| ^
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